2169994860 has 144 divisors (see below), whose sum is σ = 7446845952. Its totient is φ = 526046400.

The previous prime is 2169994859. The next prime is 2169994873. The reversal of 2169994860 is 684999612.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 2169994797 and 2169994806.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 33165 + ... + 73755.

It is an arithmetic number, because the mean of its divisors is an integer number (51714208).

Almost surely, 2^2169994860 is an apocalyptic number.

2169994860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2169994860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3723422976).

2169994860 is an abundant number, since it is smaller than the sum of its proper divisors (5276851092).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2169994860 is a wasteful number, since it uses less digits than its factorization.

2169994860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40626 (or 40612 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 54.

The square root of 2169994860 is about 46583.2036253412. The cubic root of 2169994860 is about 1294.6515681807.

The spelling of 2169994860 in words is "two billion, one hundred sixty-nine million, nine hundred ninety-four thousand, eight hundred sixty".